Working on the SQL Database is easy till there are no complex errors. But once the database encounters an error like SQL Server error 4064, situations become complex. Understanding and resolving SQL errors gets challenging when the causes are not clear.

Here we will discuss error 4064, the possible factors that led to this error, and the solutions that can help with resolving the error.


So without wasting another minute, let’s understand what the error 4064 in SQL Server is.


What is the ‘Cannot Open User Default Database’ Error?

The SQL Server error 4064 occurs when the database administrator tries to log in to their database, but the server fails to open the database linked to that login due to database unavailability. There can be numerous factors for this to happen. Here are some of the reasons that trigger the error 4064.


Due to the Unavailability of the Default Database: 

The major cause for the error ‘Cannot Open User Default Database’ is the unavailability of the required database. The database might become unavailable due to various reasons, such as:

  • The database might be deleted or removed,
  • The database has been renamed, or
  • The default database is in the restoring state


These reasons will become a cause for the occurrence of SQL Error 4064.


Insufficient Permissions of the Database: 

If the user tries to access the database but does not have sufficient permissions regarding the same, then it might be difficult to connect to the SQL database. With insufficient permissions, the chances of occurrence of the SQL Server error 4064 also increase.

 

Corruption in the Default Database: 

As the primary cause of the occurrence of this SQL error is the unavailability of the database, corruption in the database is also one of the reasons for this error. When the default database gets corrupted, it makes the database inaccessible to the server and further leads to this error.


All these reasons can become a huge factor in making the database inaccessible and further leading to the occurrence of SQL Error 4064. After understanding the causes of the error, let’s now take a look at the challenges it creates for the users while working on the database and performing day-to-day operations.


Challenges Encountered Due to the SQL Server Error 4064

There are many challenges that come along with the ‘Cannot Open User Default Database’ error. The error majorly impacts the database and the user's access to the database. There are various other challenges that occur due to this error, we will take a look at them now to understand what we are dealing with.


Inaccessibility of the Database

With the occurrence of the error, the first thing to be impacted is access to the database. When the error occurs, it instantly points out that there is something wrong with the database which has made the default database inaccessible for the user.


Affects the Applications Relying on the Database

Along with the access to the database, all the applications that rely on that specific database are also affected. With the error occurring, this can result in applications’ downtime and affect the workflow of the users.


Possible Risk of Corruption & Data Loss

Among the various factors that led to the SQL Server error 4064, one reason was corruption in the database. A corrupted database might lead to bigger challenges like data inaccessibility or complete data loss from the database.


Challenges with Database Security

If the database a user is trying to access has been deleted or removed, the server will lock out the user from connecting to the database. Additionally, if the user does not have sufficient permissions to access the database, their attempts will fail while accessing the database.


These are the challenges a user might encounter while accessing the database during the error 4064. So to help the users with the challenges and fix this SQL Server error, we will now proceed with the solutions.


How to Resolve SQL Server Error 4064 Easily?

As we read earlier, there are various factors that lead to the occurrence of the error 4064 in SQL Server, so to resolve the error caused due to these factors, we will now take a look at different solutions.


Method - 1: Resolve the Error By Setting the Database to ONLINE Mode

The user can encounter the unavailable database if the database is in offline mode. So to resolve the error and make the database accessible again, it is required to set the database back to online mode.

This can be done by using the following command:


ALTER DATABASE DB_NAME SET ONLINE;


This command will help to set the database back online and make it accessible for the server to connect. Let’s now take a look at how the next method will work to resolve the error.


Method - 2: Repair the SQL Error 4064 By Giving Required Permissions to User

Among the factors that are responsible for the error ‘Cannot Open User Default Database’, one of the reasons was insufficient permissions to the users. So to resolve the error caused due to that reason, it is required to grant the necessary permissions to the user trying to access the database. 

The command to grant permission in the database is:


USE [yourdatabase_name]

CREATE USER [yourusername] FOR LOGIN[yourusername];

ALTER ROLE db_datareader ADD MEMBER [yourusername];

ALTER ROLE db_datawriter ADD MEMBER [yourusername];


These commands will grant all the required permissions to the user login and will allow the user to access the database, but the method doesn't ensure complete resolution of the error. After understanding this method let’s now proceed with the next solution to fix the error.


Method - 3: Advanced Solution to Fix the SQL Server error 4064 Efficiently

Database corruption is not only a cause for this SQL error to occur, but it also poses a huge threat to the data within the database. To resolve the error in the SQL Server environment, using an expert solution is always a good idea. The expert solution not only offers great trust but is also reliable in terms of maintaining database integrity and security. The tool we are going to use is the SQL Database Recovery Tool. Let’s see how the tool will help with resolving the error and making the database accessible again. 

  1. Install and launch the software. Click on the Open button to add the database files to the software. 
  2. After adding the files, choose a scan mode from Quick or Advanced Scan to detect corruption in the database.
  3. After the scan is complete, the preview of the recovered files will be available to you.
  4. Next, click on the export button to export the files to the SQL Server Database. 
  5. Add the required credentials in the export window and then click on the export button to resolve the SQL Server error 4064.


This way the advanced tool helps you to repair and fix the database after the occurrence of the error ‘Cannot Open User Default Database’. 


Conclusion

With the help of this write-up, we have understood the SQL Server error 4064 and the various reasons that triggered the error. Additionally, we also discussed the challenge a user encounters when this error occurs. To help the users resolve the error, we have also suggested multiple solutions that will help them access the database again without any hassles.